CN101172391A - Container, thermo-molding apparatus and method for thermo-molding the same - Google Patents

Container, thermo-molding apparatus and method for thermo-molding the same Download PDF

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Publication number
CN101172391A
CN101172391A CNA2007101936930A CN200710193693A CN101172391A CN 101172391 A CN101172391 A CN 101172391A CN A2007101936930 A CNA2007101936930 A CN A2007101936930A CN 200710193693 A CN200710193693 A CN 200710193693A CN 101172391 A CN101172391 A CN 101172391A
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CN
China
Prior art keywords
container
former
sheet material
plug
end liner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2007101936930A
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Chinese (zh)
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CN101172391B (en
Inventor
中里槙作
竹下泰生
横山敏之
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Yoshino Kogyosho Co Ltd
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Yoshino Kogyosho Co Ltd
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Publication of CN101172391A publication Critical patent/CN101172391A/en
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Publication of CN101172391B publication Critical patent/CN101172391B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G19/00—Table service
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/34—Moulds for undercut articles
    • B29C51/343—Moulds for undercut articles having recessed undersurfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B29C51/40—Venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/40—Details of walls
    • B65D1/42—Reinforcing or strengthening parts or members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7132—Bowls, Cups, Glasses

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

The present invention provides a bottomed cylindrical container produced by thermo-molding a resin sheet. The bottomed cylindrical container consists of an upper mould (C, C') having a core bar (10, 10a), and a lower mould (D, D') having a concave mold (16, 16a) and a bottom bush (17, 17a). The concave mold (16, 16a) has a model surface (18, 19, 20, 40) forming the cylindrical container wall (2, 31). The bottom bush (17, 17a) has a pressure fluid blowing-in hole (27) and a sucking-hole (25) is formed on said concave mold (16, 16a).

Description

The thermal forming device of container
The application is dividing an application of application number is 02821374.2, the applying date is on October 30th, 2002 patent application.
Technical field
The present invention relates to the thermal forming device of container and container thereof, the thermo shaping method of container, particularly relate to the having the bottom tube-like container that bottom tube-like container and the cylindrical portion inner core of turning back from earth terminal be connected with diapire that have by hot formed band leg, the inside, junction surface of foot section or cylindrical portion inner core and cylindrical wall does not produce the container of thin-walled in gap and thermal forming device thereof, thermo shaping method.
Background technology
Having in the bottom tube-like container of the hot formed band leg that uses the thermoplastic resin sheet material, what the known position that the corresponding container inner face of a kind of leg that is shaped turning back with sheet material arranged did not in the past produce the gap has bottom tube-like container and thermal forming device thereof, a manufacturing process.For example, the Japan Patent spy opens the 2000-225642 communique, the spy opens the 2001-001395 communique and discloses this have bottom tube-like container, thermal forming device, manufacturing process.
Above-mentioned 2 kinds conventional art, all be to use following structure, promptly have: by pneumatics (Japanese: press empty) be shaped the top that constitutes with plug and cooling formpiston the plug assembly, form opening of container and cylinder perimembranous upper portion patrix, form the middle mould of the outer peripheral face of quadrate part and base (bottom rim) under the cylinder perimembranous and form the base the former assembly that inner peripheral surface and diapire constituted thermal forming device or have the pneumatics shaping and be shaped with the thermal forming device of plug, former and bed die.
The manufacturing process of container is pneumatics to be shaped be pressed in the former with plug, is at bed die under the state of down position, gives shape according to the model of former towards container, then, bed die is risen, and formation diapire on bed die forms the base between bed die and former.
And, the shape on base is made lateral surface is afterbody and amplifies shape and expand the section triangle of opening or keep the continuous vertical cylinder shape of same diameter.
Yet, in above-mentioned technology, the shape that no matter is the base is that afterbody amplifies shape, or vertical cylinder shape, all be between the model face of the model face of former (its middle mould) and bed die, to form the base, so and the footpath of the external diameter of the model face of the base outer peripheral face of formation former (its middle mould) upper end is poor, its thickness is more than the thickness of resin sheet, and the thickness than 2 times is a little bit smaller slightly.
Therefore, if 2 times of thickness of the resin sheet of use poor less than inside and outside footpath, have then produced the gap at the position of the container inner face corresponding with the base.
Thereby, in above-mentioned thermal forming device, manufacturing process, existence can not change use resin sheet thickness, can not use the problem of fine sheet.
Again, for the thin sheet material of used thickness, the footpath that must reduce to form between the model face of model face and the base inner peripheral surface of formation bed die of base outer peripheral face of former (its middle mould) is poor.
And the wall thickness in stage before the formation base is because of the thickness of sheet material base material; Temperature during hot forming; The timing of vacuum, pneumatics etc., deviation takes place in difference because of molding condition easily in practice, and it is very difficult wanting to keep than the consistent such certain molding condition in the setting gap between the thin slightly metal pattern of the sheet material wall thickness after turning back.
Like this, when the shaping of the tun that uses thick sheet, problem is fewer, but when using fine sheet, and the required precision that exists wall thickness is strict more, be not suitable for the problem that small containers is shaped.
Summary of the invention
The present invention will address the above problem as problem, its purpose is, provide about the wall thickness that is not subjected to sheet material, especially to the hot forming of the sheet material of thin-walled effectively and be shaped applicable to smallclothes to the container of big part, the inner gapless band leg of leg the bottom tube-like container is arranged or gapless thermal forming device and the thermo shaping method thereof that bottom tube-like container and these container shaping usefulness are arranged between cylindrical portion inner core of turning back and cylindrical wall from earth terminal.
In order to solve above-mentioned problem, provided by the invention have a bottom tube-like container, constitute by cylindrical wall, diapire with perpendicular to the ring-type leg of diapire, it is characterized in that, this container obtains by the hot forming of resin sheet, described leg utilizes pressure fluid to turn back inwall back and outer wall is fused into one, forms the leg that is made of inner and outer wall thus.Preferably, described diapire is made of central portion and periphery, and this periphery is a thin-walled.
Again, according to the present invention, the bottom tube-like container is arranged by cylindrical wall and the diapire of lower end as earth terminal constituted, it is characterized in that, this container obtains by the hot forming of resin sheet, described diapire is connected with the upper end of inwall, this inwall be with cylindrical wall along described earth terminal turn back the back with cylindrical wall interior week be fused into one.
Again, according to the present invention, following a kind of device that resin sheet is thermoformed into the bottom tube-like container is provided, by patrix and have former and the counterdie of end liner cover constitutes with plug, described female mold has the model face that forms the container cylindrical wall, the end liner cover has pressure fluid and is blown into the hole, and forms the attraction hole on described former.According to another viewpoint of the present invention, following a kind of device that the bottom tube-like container is arranged that resin sheet is thermoformed into the band leg can be provided, by patrix and have former and the counterdie of end liner cover constitutes with plug, described former is formed with and attracts the hole, the model face that described female mold has the model face that forms the container cylindrical wall, the model face that forms the container bottom perisporium and forms the leg outer wall, described end liner cover has pressure fluid and is blown into the hole.In these devices, preferably described counterdie is made of the former on cover of the end liner in model seat, the model seat and the model seat, be provided with the gap between the following and model seat of former, be provided with ring-type between the following and model seat of former and attract groove, be communicated with described gap.
Again, according to another viewpoint of the present invention, following a kind of thermo shaping method that the bottom tube-like container is arranged with leg can be provided, the thermoplastic resin sheet material is heated, in vacuum attraction, to heat sheet material by the plug of patrix is pressed into, model face crimping with the former of sheet material and counterdie, form the cylindrical wall of container and the outer wall of leg, in vacuum attraction, the hole that is blown into of the end liner cover of pressure fluid by counterdie is blown in former, the sheet material on end liner cover top and the following crimping of plug, form the inwall of diapire and leg, on this position with inwall and outer wall welding.
Again, according to the present invention, following a kind of thermo shaping method that the bottom tube-like container is arranged can be provided, the thermoplastic resin sheet material is heated, in vacuum attraction, to heat sheet material by the plug of patrix is pressed into, model face crimping with the former of sheet material and counterdie, form the cylindrical wall of container, in vacuum attraction, the hole that is blown into of the end liner cover of pressure fluid by counterdie is blown in former, with the sheet material and the following crimping of plug on end liner cover top, the formation diapire and with the inwall of cylindrical wall welding.
Description of drawings
Fig. 1 (a) is the part section front view that the bottom tube-like container is arranged of the band leg of the present invention's the 1st example, and Fig. 1 (b) is for wanting portion's enlarged drawing.
Fig. 2 is the part section front view of the thermal forming device of the present invention's the 1st example.
Fig. 3 begins the part section front view of back thermal forming device state, Fig. 2 for expression matched moulds, plug descend.
Fig. 4 (a) arrives the part section front view of down position, thermal forming device when vacuum forming finishes, Fig. 2 for the expression plug, and Fig. 4 (b) is for wanting portion's enlarged drawing.
The part section front view of thermal forming device state, Fig. 2 when Fig. 5 is shaped for the pneumatics of representing container bottom.
The part section front view of thermal forming device when Fig. 6 finishes for the pneumatics of representing container bottom is shaped, Fig. 2.
Fig. 7 is the sectional front view that the bottom tube-like container is arranged of the present invention's the 2nd example.
Fig. 8 arrives the part section front view of down position, thermal forming device when vacuum forming finishes, the 2nd example for the expression plug.
The part section front view of thermal forming device when Fig. 9 finishes for the pneumatics of representing container bottom is shaped, Fig. 8.
The specific embodiment
Example of the present invention is described with reference to the accompanying drawings.
At first, illustrate the present invention's the 1st example the band leg bottom tube-like container or band leg arranged end bowl A arranged.
As shown in Figure 1, the band leg the bottom tube-like container A arranged, have cylindrical wall 2, the diapire 3 of export-oriented flange 1 and the ring-type leg 4 that extends from diapire 3 constitutes downwards by the peristome periphery.
Inwardly the side is crooked in the bottom for cylindrical wall 2, and horizontal ground arrives leg 4 always, and this horizontal part is exactly an end perisporium 5, is connected with diapire 3.Diapire 3 is positioned at the inboard of leg 4, is made of central part 6a and the periphery 6b thinner than the wall of central part 6a.
Leg 4, by outer wall 7a and in the lower end of outer wall 7a inwardly the side turn back, constitute with the inwall 7b of outer wall 7a integral welding.Periphery is formed with bellying 8 in the lower end of leg 4.
As the resin material of container A, be suitable for the polyolefin-based resins of polypropylene (PP), polyethylene (PE) etc., but also can use the synthetic resin or the thermoplastic synthetic resin of PET (PET) and other thermoformable.Synthetic resin sheet material is individual layer both, also duplexer.
Thickness as the sheet material of material is 0.3～3.0mm.In addition, the wall thickness of the container cylindrical wall that obtains by this sheet material hot forming is about 0.1～about 0.45mm.
Briefly explain the employed thermal forming device B of container hot forming of the present invention's the 1st example below.
As shown in Figure 2, thermal forming device B is made of patrix C and counterdie D.
Patrix C is made of with the plug 10 that relative clamping 11 can move up and down the cylindric clamping 11 that clamping sheet material S uses.Again, sheet material S is heated by heater (not shown).The shape of clamping 11 is not limited to cylindric.
Plug 10 has cylinder wall 12 and smooth following 13.In clamping 11, pressure fluid (forced air etc.) is blown into from the top, but being blown into of pressure fluid is optional.
In illustrated example, plug 10 has drum, but also coniform or other shape.Can be according to formed products, below 13, except the plane, also can adopt shapes such as male bend curved surface, recessed flexure plane.
Counterdie D is made of model seat 15, the end liner cover 17 that is equipped on the former 16 of these model seat 15 tops and is equipped on model seat 15 inside.
Former 16 has and forms the shapable model face 18 that cylindrical wall 2 usefulness of bottom tube-like container A are arranged, forms the model face 19 of end perisporium 5 usefulness and form the model face 20 that the outer peripheral face of leg 4 is used.Periphery is formed with path 21 in the lower end of model face 20, thus, is formed with gap 21 below former 16 and between the model seat 15.This gap 21 is connected with the attraction groove 22 of ring-type.
Connecting hole 23 in attracting groove 22 and being equipped on model seat 15 is connected, and connecting hole 23 is connected with vacuum plant (not shown).Be formed with intercommunicating pore 24 on former 16, this intercommunicating pore 24 is connected with connecting hole 23.Near the upper end of the model face 18 of former 16 and bottom is equipped with a plurality of attractions hole 25, attracts hole 25 to be connected with intercommunicating pore 24 respectively.Thus, utilize described vacuum plant, attract by connecting hole 23, attraction groove 22, gap 21 and attraction hole 25 air with former 16 inside.
26 central authorities are equipped with a plurality of holes 27 that are blown on end liner cover 17.Be formed with connecting hole 28 in end liner cover 17, this connecting hole 28 is connected with pressure air source (not shown).Thus, by connecting hole 28 be blown into hole 27, pressure fluid (forced air etc.) is blown into former 16 inside.
In end liner cover 17, be equipped with heater 29.
The following describes the thermo shaping method of the container of the present invention's the 1st example.
During hot forming, sheet material S is heated to the forming temperature lower slightly than fusing point by heater (not shown).The former 16 of thermal forming device B, end liner cover 17 is also by heater 29 heating and keep set point of temperature (about 80～about 150 ℃ usually, according to the different materials of sheet material, about 50～about 180 ℃), in this occasion, for the sheet material after the heating is not cooled off, should adjust the temperature of former 16 and end liner cover 17.
For example, in the occasion of the PP of 1.0mm thickness resin sheet, be heated to 140 ℃～200 ℃.
From the state of Fig. 2, patrix C is descended, counterdie D rises.As shown in Figure 3, heated sheet material S is held between former 16 top of the clamping 11 that is pressed into patrix C and counterdie D.Secondly, make plug 10 relative clampings 11 declines, sheet material S is heated and softens, so following 13 sheet material S being stretched downwards of plug 10.At this moment, if by gap 21 and attraction hole 25 air is attracted, then sheet material S is attracted to and attracts hole 25, engages with the inner face that is positioned at the former that attracts 25 tops, hole.At this moment, also can in last direction clamping 11, be blown into pressure fluid.
If make plug 10 continue to descend, then sheet material S is by gap 21 with attract hole 25 to attract, and as shown in Figure 4, the model face 18,19,20 of sheet material S and former 16 and end liner overlap 17 top 26 engage.Thus, sheet material S has been given shape by top 26 of the model face 18,19,20 of former 16 and end liner cover 17, forms the outer wall 7a of cylindrical wall 2, end perisporium 5 and the leg 4 of container A.
As shown in Figure 4, plug 10 stops at place, the front of model face 19, does not contact with the model face 19 of former 16, forms the gap between 13 below sheet material S on model face 19 and the plug 10.When pressure air described later was blown in former 16, air was emitted by this gap.In illustrated embodiment, this gap is about 0.1～about 0.5mm.
By vacuum attraction, resin a is attracted in the gap 21, becomes the bellying 8 of container.Because of resin a is attracted in the gap 21, so with gap 21 obturations, gap 21 can not be proceeded to attract.End liner cover 17 is heated to above-mentioned set point of temperature by heater 29, and sheet material S is maintained near the forming temperature of fusing point with top 26 parts that contact of end liner cover 17.
As mentioned above, utilize to attract the vacuum attraction (and, preferably the forced air in the clamping 11) in hole 25, sheet material S and 19 crimping of model face, the resin a of sheet material S bottom is attracted in the gap 21, and sheet material S is maintained near the forming temperature of fusing point with top 26 parts that contact of end liner cover 17.In this state, as shown in Figure 5, with pressure fluid during, be maintained at the part of the sheet material S of the temperature fusing point near, turned back as broken line in the lower end of outer wall 7a, move upward from being blown into hole 27 and being blown into former 16 in of end liner cover 17.Therefore, be maintained in the part of the sheet material S of the temperature fusing point near, central portion 13 engages below plug.Again, periphery becomes the inwall 7b of container, is turned back and extend as broken line in the lower end of outer wall 7a, and 7a engages with outer wall, with outer wall 7a welding.Like this, formed leg 4, as shown in Figure 6, finished the shape of being given that the bottom tube-like container is arranged of band leg by outer wall 7a and inwall 7b integral welding.
At this moment, the periphery of the sheet material S that is bloated is stretched, and the periphery 6b of the diapire 3 after the shaping is thinner than central part 6a wall.Again, because sheet material S is maintained near the temperature the fusing point, the therefore sheet material S part welding that engages with relative model face 20 of the part of turning back.
Again, the plug of crooked face upward below the use diapire being carried out pneumatics when being shaped, can make central portion become thin-walled.
Then, the bottom tube-like container A that has of the band leg after being shaped is cooled off, in model, taken out, export-oriented flange 1 is cut into desired shape, finish the shaping that the bottom tube-like container A is arranged of band leg thus.
The band leg that obtains the bottom tube-like container A arranged, the inwall 7b of leg 4 and outer wall 7a are fused into integrated, do not have the gap fully, the wall thickness that becomes cylindrical wall 2 and diapire 3 etc. is about the container of the thin-walled of 0.2mm.
The following describes the variant embodiment of above-mentioned example.
In the above-mentioned example, when pressure air is blown into, plug 10 stops at place, the front that engages with the model face 19 of former 16, between 13, is formed with the gap of the air discharge usefulness between the sheet material S and following 13 that is present in position on the end liner cover 17 below the sheet material S on model face 19 and the plug 10.But also can use with blow vent be equipped on following 13 and cylinder wall 12 between plug 10,13 position below the plug is become and sheet material S can be formed form with 19 extruding of model face to end perisporium.
Secondly, if pressure fluid is blown into by being blown into hole 27, the sheet material S that then is present in position on the end liner cover 17 and plug 10 following 13 between air, can be by above-mentioned blow vent discharge.
As other 1 variation, after vacuum forming, with above the plug 13 stop at more in front of, there is 0.5～1.5mm in gap from the sheet face, if the be blown into hole 27 of pressure fluid from end liner cover 17 is blown into and carries out pneumatics and be shaped, then can obtain diapire 3 protrude upward from end perisporium 5 shape the band leg the bottom tube-like container arranged.
The following describes the container of the 2nd example and thermal forming device thereof, manufacturing process.
This example is relevant have bottom tube-like container (cup-like containers) and manufacturing process thereof.
Among Fig. 7, A ' has the bottom tube-like container, and the cylindrical wall 31 and the diapire 32 that are had export-oriented flange 30 by the peristome periphery constitute.
The lower end of cylindrical wall 31 becomes earth terminal 33.Cylindrical wall 31 is inwardly just turned back earth terminal 33 as broken line, forms inwall 34.The upper end 35 of inwall 34 is connected with diapire 32.
Inwall 34 was fused on the interior week of the cylindrical wall 31 below described upper end 35, did not have the gap between cylindrical wall 31 and inwall 34.
The following describes the thermo shaping method of the container of the 2nd example.
The thermal forming device that the 2nd example uses is that the shape of the counterdie of the thermal forming device of the 1st example has been done change, and additional a makes diagram in identical component part, is that the center describes below with the difference.
Among Fig. 8, C ' is a patrix, and D ' is a counterdie.
The same with above-mentioned the 1st example, patrix C ' is made of with the plug 10a that relative clamping 11a can move up and down clamping 11a cylindraceous.Again, sheet material S ' is heated by heater (not shown).Plug 10a has cylinder wall 12a and smooth following 13a.In clamping 11a, pressure fluid (forced air etc.) is blown into from the top, but being blown into of pressure fluid is optional.
Counterdie D ' is made of model seat 15a, the end liner cover 17a that is equipped on the former 16a of this model seat 15a top and is equipped on model seat 15a inside.
Former 16a, what have that formation need be shaped has a bottom tube-like container A ' the model face 40 of cylindrical wall 31 usefulness.Periphery is formed with path 21a in the lower end of model face 40, thus, has formed gap 21a below former 16a and between the model seat 15a.This gap 21a is connected with the attraction groove 22a of ring-type, and this attracts groove 22a to be connected with vacuum plant (not shown).
The central authorities of 26a are equipped with a plurality of hole 27a that are blown on end liner cover 17a.This is blown into hole 27a and is connected with pressure air source (not shown).
In end liner cover 17a, be equipped with heater 29a.
The following describes the thermo shaping method that the bottom tube-like container is arranged of the 2nd example.
During hot forming, the same with above-mentioned the 1st example, sheet material S ' is heated to the forming temperature lower slightly than fusing point by heater (not shown).The former 16a of thermal forming device B ', end liner cover 17a also are maintained at above-mentioned set point of temperature.
Between the sheet material S ' of heating is held above the former 16a of the clamping 11a that is pressed into patrix C ' and counterdie D '.Secondly, the relative clamping 11a of plug 10a is descended, sheet material S ' is heated, so the following 13a of plug 10a stretches sheet material S ' downwards.At this moment, be blown into forced air from patrix C '.Again, the gap 21a below former 16a carries out vacuum attraction, and sheet material S ' is attracted to gap 21a.Thus, sheet material S ' engages with the model face 40 of former 16a.
If plug 10a continue to be descended, as shown in Figure 8, stop to become not model face 40 state of contact with former 16a.Sheet material S ' is endowed becomes that 26a engages above the model of former 16a face 40 and the end liner cover 17a, overlap the mould shapes that 26a constituted above the 17a by model face 40 and the end liner of former 16a.At this moment, formed the bottom tube-like container A is arranged ' cylindrical wall 31 and diapire 32 on formed sheet material part.
The same with above-mentioned the 1st example, during vacuum attraction, resin a is inhaled in the 21a of gap.Again, end liner cover 17a is heated to above-mentioned set point of temperature by heater 29a, and the sheet material on the top 26a of end liner cover 17a partly is maintained near the forming temperature the fusing point.
Like this, by vacuum attraction and pneumatics, sheet material S ' and model face 40 and 26a crimping above the end liner cover 17a, the resin a of cylindrical wall 31 bottoms of sheet material S ' is inhaled in the 21a of gap.Then, as shown in Figure 9, pressure air is blown into from the hole 27a that is blown into of end liner cover 17a.The part of the sheet material of 26a is turned back earth terminal 33 above described as broken line, and its central portion engages with 13a below the plug.Periphery engages and welding with the inner peripheral surface of cylindrical wall 31.What like this, can obtain the inwall of will turn back from the earth terminal 33 of cylindrical wall shown in Figure 7 31 34 and cylindrical wall 31 weldings has a bottom tube-like container A '.
Adopt above-mentioned structure, the present invention can obtain following effect.
Because band leg of the present invention has a bottom tube-like container, do not form the gap at the container inner face corresponding with leg, so content can not enter.
Again, also be with inwall and cylindrical wall welding after turning back from the earth terminal of cylindrical wall because the bottom tube-like container is arranged, between it, do not form the gap, so content can not enter.
Because the occasion of after heating such as food being filled into container, implementing to seal, cooling off, for cooled decompression, in the bottom tube-like container is arranged, the periphery of diapire is a thin-walled, and, having in the bottom tube-like container, diapire is a thin-walled, therefore diapire plays a part the decompression absorbing surface, can reduce the distortion of sealing surface and fall into (Japanese: Chi こ body falls).
Again, adopt thermo shaping method of the present invention and thermal forming device, owing to the leg or the diapire of ring-type formed by pneumatics, therefore, even the thickness of sheet material changes, for the bottom tube-like container is arranged, also can be configured as gapless leg, when using cup type machine commonly used by resin bed welding with the interior perimembranous peripheral part of leg, also owing to be with inwall and cylindrical wall welding after turning back from the earth terminal of cylindrical wall, so between it, do not form the gap.
Thus, use same building mortion,, freely change the thickness of sheet material even same shapes of containers also can be changed resin material.
Again,, can use thin sheet material, reduce wall thickness, therefore can save material owing to different purposes according to container.
Owing to the thickness of sheet material without limits, therefore, the occasion of bottom tube-like container is arranged, as hot apparatus for shaping, only need model face with the end perisporium of the following and former of plug to engage or approaching, the container from the container of big part to smallclothes all can be shaped.
Again, use thin sheet material, the smallclothes container is shaped.

Claims (3)

1. one kind is thermoformed into the device of bottom tube-like container with resin sheet, it is characterized in that,
By patrix (C, C ') and have former (16,16a) and the counterdie (D, D ') of end liner cover (17,17a) constitutes with plug (10,10a),
Described former (16,16a) has the model face (18,19,20,40) that forms container cylindrical wall (2,31),
End liner cover (17,17a) has pressure fluid and is blown into hole (27), and goes up to form at described former (16,16a) and attract hole (25).
One kind with resin sheet be thermoformed into the band leg (4) the device that the bottom tube-like container is arranged, it is characterized in that,
By the patrix with plug (10) (C) and have former (16) and the counterdie (D) of end liner cover (17) constitutes,
Described former (16) is formed with and attracts hole (25),
The model face (20) that described former (16) has the model face (18) that forms container cylindrical wall (2), the model face (19) that forms container bottom perisporium (5) and forms leg 4 outer walls (7a),
Described end liner cover (17) has pressure fluid and is blown into hole (27).
3. thermal forming device as claimed in claim 1 is characterized in that,
Described counterdie (D, D ') is by the former on the end liner cover in the model seat (15,15a), model seat (15,15a) (17,17a) and the model seat (15,15a) (16,16a) formation,
Be provided with gap (21,21a) between the following and model seat of former (16,16a) (15,15a),
Be provided with ring-type between the following and model seat of former (16,16a) (15,15a) and attract groove (22,22a), be communicated with described gap (21,21a).
CN2007101936930A 2001-10-30 2002-10-30 Container thermo-molding apparatus Expired - Fee Related CN101172391B (en)

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